Electrode Wear Prevention in Drum Insertion Mechanisms
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Solution Overview
Problem
Conventional color laser printers face issues with electrode wear during the insertion and removal of drum units, leading to contact failures and inadequate power supply to image forming units due to the sliding contact between receiving and supplying electrodes.
Innovation Solution
The design includes a first support member with a receiving electrode that extends orthogonally to the insertion direction, allowing for direct contact with a supplying electrode within the unit accommodating section, preventing wear and ensuring consistent power supply to the image forming units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the receiving electrode and supplying electrode are arranged in parallel to the drum-mounting direction, then the drum unit can be easily inserted and removed, but the electrodes are worn due to sliding contact during insertion and removal operations
Solution Approach 1:
The receiving electrode is positioned upstream in the insertion direction, and the supplying electrode is positioned downstream, so that during insertion the receiving electrode makes contact with the supplying electrode before other electrodes. This preliminary contact arrangement prevents other electrodes from gridding against the electrode pair, thereby preventing wear and maintaining reliable electrical contact throughout the drum unit's service life
2Device complexity
If the receiving electrode is disposed on the downstream side and supplying electrode on the upstream side, then the drum unit structure is simplified, but other electrodes grid over these electrodes during insertion causing excessive wear
Solution Approach 1:
By reversing the conventional arrangement and placing the receiving electrode upstream and supplying electrode downstream, the patent ensures that this electrode pair makes contact first during insertion. This preliminary contact prevents other electrodes from sliding over them, eliminating the gridding effect that causes excessive wear while maintaining a simple overall electrode structure
3Ease of operation
If the electrodes are arranged to facilitate drum unit detachment, then the drum unit can be easily removed, but the electrodes are worn to a large extent giving rise to contact failures
Solution Approach 1:
The patent positions the receiving electrode upstream and supplying electrode downstream in the insertion direction, creating a contact sequence where this electrode pair engages first. This arrangement protects the electrodes from wear during both insertion and removal operations, preventing contact failures while maintaining easy drum unit detachment capabilities
Data Source
AI summary
An image forming device includes an image-bearing unit and a unit accommodating section. The image-bearing unit includes a plurality of image forming unit each having an image bearing member on which an electrostatic latent image is formed. The image-bearing unit is detachably accommodated in the unit accommodating section by being inserted in a first direction. The image-bearing unit includes a first support member extending in a second direction orthogonal to the first direction and a first receiving electrode disposed on the first support member. The first receiving electrode receives electric power to be supplied to the image forming units. The unit accommodating section includes a first supplying electrode that contacts the first receiving electrode and supplies the electric power to the first receiving electrode.